Inventor and Designer of Postural Control Insoles
Two of the most common Pelvic Syndromes that occur with the Rothbarts Foot and the PreClinical Clubfoot Deformity
Piriformis Syndrome and Lumbar Nerve Syndrome
Yeoman W 1928. The relation of arthritis of the sacroiliac joint to sciatica with an analysis of 100 cases. Lancet (2):1119-1122
Chaitow L, Walker J, 2000. Clinical Application of Neuro Muscular Techniques. Volume I, The Upper Body. Churchill Livingstone
Anterior Rotation of the Innominate places the Piriformis Muscle on a Stretch. This can compress the Sciatic Nerve (black arrow) against the rotated tightened muscle belly of the Piriformis and result in Sciatica
Piriformis Stretch Test
Piriformis Stretch Test is used to determine if the Piriformis muscle is compressing (entrapping) the sciatic nerve against the greater sciatic notch.
Piriformis Stretch Test (for the right side):
Patient Position: supine (lying face up), flat on back
While performing this test, it is important that:
Interpretation of Results:
If the right sciatic pain is reduced while running this test, the right Piriformis muscle is in spasm and is compressing (entrapping) the right sciatic nerve against the greater sciatic notch (e.g., Piriformis Syndrome).
If the right sciatic pain is not reduced while running this test, the right Piriformis muscle is not compressing (entrapping) the right sciatic nerve against the greater sciatic notch.
Yeoman was the first describe piriformis syndrome in 1928. Based on 100 case studies (patients with low back pain), Yeoman diagnosed 36 as having periarthritis involving the anterior sacroiliac ligament, the piriformis muscle and the adjacent radicals of the sciatic nerve (although Yeoman do not mention the term 'piriformis syndrome' in his original paper).
In one recent hospital study, 45 of 750 patients with low back pain were found to have piriformis syndrome. Other studies have estimated the incidence of piriformis syndrome in sciatic patients at 6%.
In approximately 15% of the population, the peroneal portion of the sciatic nerve passes through the muscle belly of the piriformis muscle, or the undivided sciatic nerve penetrates the belly of the piriformis muscle. These people are more prone to develop a mechanically induced piriformis syndrome (Chaitow and Walker, 2000)